Reject Mail before recive it....

[madmucho]

Hi users, i want to ask you about your postfix configuration, which servers in recipient restrictions you use? Today next one from my list is down, and i dont know source of this server list..My config is here

smtpd_recipient_restrictions =
            reject_invalid_hostname,
            reject_unknown_recipient_domain,
            reject_unauth_pipelining,
            permit_mynetworks,
            permit_sasl_authenticated,
            reject_unauth_destination,
            reject_rbl_client multi.uribl.com,
            reject_rbl_client dsn.rfc-ignorant.org,
            reject_rbl_client dul.dnsbl.sorbs.net,
            reject_rbl_client list.dsbl.org,
            reject_rbl_client sbl-xbl.spamhaus.org,
            reject_rbl_client bl.spamcop.net,
            reject_rbl_client dnsbl.sorbs.net,
            reject_rbl_client blackholes.easynet.nl,
            reject_rbl_client cbl.abuseat.org,
            permit

I search for reliable source, sometime happens one of this in list is down, and mail is automaticaly rejected :/